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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--              A D A . C A L E N D A R . A R I T H M E T I C               --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 2006-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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package body Ada.Calendar.Arithmetic is
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   --------------------------
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   -- Implementation Notes --
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   --------------------------
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   --  All operations in this package are target and time representation
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   --  independent, thus only one source file is needed for multiple targets.
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   ---------
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   -- "+" --
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   ---------
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   function "+" (Left : Time; Right : Day_Count) return Time is
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      R : constant Long_Integer := Long_Integer (Right);
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   begin
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      return Arithmetic_Operations.Add (Left, R);
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   end "+";
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   function "+" (Left : Day_Count; Right : Time) return Time is
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      L : constant Long_Integer := Long_Integer (Left);
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   begin
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      return Arithmetic_Operations.Add (Right, L);
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   end "+";
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   ---------
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   -- "-" --
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   ---------
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   function "-" (Left : Time; Right : Day_Count) return Time is
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      R : constant Long_Integer := Long_Integer (Right);
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   begin
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      return Arithmetic_Operations.Subtract (Left, R);
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   end "-";
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   function "-" (Left, Right : Time) return Day_Count is
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      Days         : Long_Integer;
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      Seconds      : Duration;
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      Leap_Seconds : Integer;
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      pragma Warnings (Off, Seconds);        -- temporary ???
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      pragma Warnings (Off, Leap_Seconds);   -- temporary ???
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      pragma Unreferenced (Seconds, Leap_Seconds);
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   begin
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      Arithmetic_Operations.Difference
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        (Left, Right, Days, Seconds, Leap_Seconds);
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      return Day_Count (Days);
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   end "-";
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   ----------------
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   -- Difference --
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   ----------------
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   procedure Difference
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     (Left         : Time;
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      Right        : Time;
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      Days         : out Day_Count;
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      Seconds      : out Duration;
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      Leap_Seconds : out Leap_Seconds_Count)
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   is
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      Op_Days  : Long_Integer;
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      Op_Leaps : Integer;
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   begin
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      Arithmetic_Operations.Difference
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        (Left, Right, Op_Days, Seconds, Op_Leaps);
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      Days := Day_Count (Op_Days);
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      Leap_Seconds := Leap_Seconds_Count (Op_Leaps);
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   end Difference;
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end Ada.Calendar.Arithmetic;

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